Chapter 237P23.10Let the third bead have charge Qand be located distance xfrom the left end of the rod. This beadwill experience a net force given byFii=+−−kqQxkqQdxee322bgbgafej±±.The net force will be zero if 31x=−af, or x−=3.This gives an equilibrium position of the third bead of xd=0634..The equilibrium is stable if the third bead has positive charge .P23.11(a)Fkere==×⋅××=×−−−2291921028899 10160 100529 10822 10....Nm CCmN(b)We have Fmvr=2from whichvFrm==×××−−−10911 10219 10810316...N 0.529mkgms.P23.12The top charge exerts a force on the negative charge xed222ch+which is directed upward and to theleft, at an angle of tan−FHGIKJ
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